3Com 10014299 Figure 104 Final bridging address table, Figure 105 Forward

292 CHAPTER 19: CONFIGURING BRIDGE
Figure 104 Final bridging address table
Forward and Filter
The bridge will make the decision to forward frames or not (that is, to filter
frames) depending on the following three conditions:
■If Workstation A sends an Ethernet frame whose destination is Workstation C,
the bridge will detect this frame and learn that Workstation C corresponds to
Bridge port 2 by looking up its bridging table. So, it will forward the frame to
Bridge port 2, as shown in the following figure.
Figure 105 Forward
Note that the bridge will forward the broadcast or multicast frames received on
one port to the other ports.
Given that Workstation A sends an Ethernet frame to Workstation B, the
bridge will filter this frame rather than forwarding it, since Workstation B and
Workstation A are located on the same physical network segment.
Bridge
Ethernet segment1
Bridge port1
Bridge port2
Ethernet segment2
00e0.fcaa.aaaa
Bridging table
MAC address
00e0.fcbb.bbbb
00e0.fccc.cccc
00e0.fcdd.dddd
00e0.fcaa.aaaa Port
1
1
2
2
00e0.fcbb.bbbb
00e0.fccc.cccc 00e0.fcdd.dddd
Workstation A
Workstation C
Workstation B
Workstation D
00e0.fccc.cccc 00e0.fcaa.aaaa
Destination addressSource address
Bridge
Source address Destination address
Ethernet segment1
Bridge port1
Bridge port 2
00e0.fccc.cccc 00e0.fcdd.dddd
Ethernet segment2
00e0.fcaa.aaaa 00e0.fcbb.bbbb
Bridging table
MAC address
00e0.fcbb.bbbb
00e0.fccc.cccc
00e0.fcdd.dddd
00e0.fcaa.aaaa Port
1
1
2
2
00e0.fcaa.aaaa 00e0.fccc.cccc
Forwarding
Workstation A Workstation B
Workstation C
Workstation D